/*
 * Copyright 2021 The Error Prone Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.errorprone.bugpatterns;

import com.google.errorprone.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** {@link AlwaysThrows}Test */
@RunWith(JUnit4.class)
public class AlwaysThrowsTest {
  private final CompilationTestHelper testHelper =
      CompilationTestHelper.newInstance(AlwaysThrows.class, getClass());

  @Test
  public void positive() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import java.time.Instant;

            class T {
              void f() {
                // BUG: Diagnostic contains: will fail at runtime with a DateTimeParseException
                Instant.parse("2007-12-3T10:15:30.00Z");
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negative_nonLiteral() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import java.time.Instant;

            class T {
              void f() {
                Instant.parse(toString() + "foo");
              }
            }
            """)
        .doTest();
  }

  @Test
  public void instantWithPeriodThrows() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import java.time.Duration;
            import java.time.Instant;
            import java.time.Period;

            class T {
              void f() {
                Instant instant = Instant.now();
                instant = instant.plus(Duration.ofDays(1));
                instant = instant.plus(Period.ofDays(1));
                instant = instant.plus(Period.ofWeeks(1));
                // BUG: Diagnostic contains: fail at runtime with a UnsupportedTemporalTypeException
                instant = instant.plus(Period.ofMonths(1));
                // BUG: Diagnostic contains: fail at runtime with a UnsupportedTemporalTypeException
                instant = instant.plus(Period.ofYears(1));
                // BUG: Diagnostic contains: fail at runtime with a UnsupportedTemporalTypeException
                instant = instant.minus(Period.ofMonths(1));
                // BUG: Diagnostic contains: fail at runtime with a UnsupportedTemporalTypeException
                instant = instant.minus(Period.ofYears(1));
              }
            }
            """)
        .doTest();
  }

  @Test
  public void immutableMapThrows() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableMap;

            class Test {
              private static final ImmutableMap<Integer, Integer> xs =
                  ImmutableMap.<Integer, Integer>builder()
                      .put(1, 1)
                      // BUG: Diagnostic contains:
                      .put(1, 2)
                      .buildOrThrow();
            }
            """)
        .doTest();
  }

  @Test
  public void immutableBiMapThrows() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableBiMap;

            class Test {
              private static final ImmutableBiMap<Integer, Integer> xs =
                  ImmutableBiMap.<Integer, Integer>builder()
                      .put(1, 1)
                      // BUG: Diagnostic contains:
                      .put(2, 1)
                      .buildOrThrow();
            }
            """)
        .doTest();
  }

  @Test
  public void immutableMapDoesNotThrow() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableMap;

            class Test {
              private static final ImmutableMap<Integer, Integer> xs =
                  ImmutableMap.<Integer, Integer>builder().put(1, 1).put(2, 2).buildOrThrow();
            }
            """)
        .doTest();
  }

  @Test
  public void immutableMapOfThrows() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableMap;

            class Test {
              private static final ImmutableMap<Integer, Integer> xs =
                  // BUG: Diagnostic contains:
                  ImmutableMap.of(1, 1, 1, 2);
            }
            """)
        .doTest();
  }

  @Test
  public void immutableMapOfThrowsWithEnums() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableMap;

            class Test {
              private enum E {
                A,
                B
              }

              private static final ImmutableMap<E, Integer> xs =
                  // BUG: Diagnostic contains:
                  ImmutableMap.of(E.A, 1, E.A, 2);
            }
            """)
        .doTest();
  }

  @Test
  public void immutableBiMapOfThrowsWithEnums() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableMap;

            class Test {
              private enum E {
                A,
                B
              }

              private static final ImmutableMap<E, Integer> xs =
                  // BUG: Diagnostic contains:
                  ImmutableMap.of(E.A, 1, E.A, 2);
            }
            """)
        .doTest();
  }

  @Test
  public void immutableMapOfThrowsWithRepeatedFinalVariable() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableBiMap;

            class Test {
              ImmutableBiMap<String, Integer> map(String s) {
                // BUG: Diagnostic contains:
                return ImmutableBiMap.of(s, 1, s, 2);
              }

              ImmutableBiMap<Integer, String> values(String s) {
                // BUG: Diagnostic contains:
                return ImmutableBiMap.of(1, s, 2, s);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void immutableMapWithComplexKeys() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.collect.ImmutableMap;
            import java.time.Duration;

            class Test {
              private static final ImmutableMap<Duration, Integer> xs =
                  // BUG: Diagnostic contains: Duration.ofMillis(1)
                  ImmutableMap.of(Duration.ofMillis(1), 1, Duration.ofMillis(1), 2);
            }
            """)
        .doTest();
  }

  @Test
  public void uuidFromString() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.UUID;

            class Test {
              // BUG: Diagnostic contains:
              private final UUID uuid = UUID.fromString("foo");
            }
            """)
        .doTest();
  }

  @Test
  public void uuidFromString_withNonLiteral() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.UUID;

            class Test {
              private final UUID uuid = UUID.fromString(toString());
            }
            """)
        .doTest();
  }
}
